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27.
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In a
family, each daughter has the same number of brothers as she has sisters and
each son has twice as many sisters as he has brothers. How many sons are
there in the family ?
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Answer: Option B
Explanation:
Let d and s represent the number of daughters
and sons respectively.
Then, we have :
d - 1 = s and 2 (s - 1) = d.
Solving these two equations, we get: d = 4, s
= 3.
